Box for electrical wiring systems



Nov. 7, 1933. J G FULLMAN 1,934,300

BOX FOR ELECTRICAL WIRING SYSTEMS Filed Sept. 27, 1929 Patented Nov. 7, 1933 UNITED STATES PATENT OFFICE BOX FOR ELECTRICAL WIRING SYSTEMS Application September 27, 1929 Serial No. 395,501

3 Claims.

This invention relates to an improved outlet box which is particularly suitable for embedding in concrete. Such boxes as heretofore manufactured have been made octagonal in shape, and

for securing the same to the sub-flooring or wooden concrete forms. Such boxes have been provided with lugs which were riveted to certain of the fiat octagonal sides of the box.

The present invention is directed to an improved box in which the lugs are attached to the box in a novel manner and in a novel location with the object of not only securing greater strength but with the further object of providing more clear space at the sides of the box at points where the lugs were previously applied. In this way the knockouts in the sides of the box are more accessible than heretofore and it is also possible to have more of such knockouts than has heretofore been possible with boxes wherein the attaching lugs were disposed at the sides.

In the drawing:

Figure 1 is a side elevation of my improved box;

Fig. 2 is a top plan view taken substantially on line 2-2;

Fig. 3 is an enlarged detail view taken on line 33 of Fig. 2.

In more detail 10 is the conventional sheet metal octagonal shaped box. Certain interior detail parts are not shown because these are of conventional form and form no part of the present invention. 11 is the concrete in which the box is embedded. 12 is the wooden flooring form. 13 are the knockouts which are disposed in the walls of the octagonal shaped box, 14 are the attaching lugs provided with holes or slots in the base to receive the nails 15 by which the box is fastened to the wooden form 12. In lieu of attaching the lugs to the fiat sides of the box as heretofore and thus occupying space which otherwise would be available for knockouts 13, I preferably attach the lugs to the corners of the box shaping the vertical portions of each lug at angles to each other as shown at 17 and tapering off the exterior edges towards the top as shown at 18. The lug thus fabricated is attached to the box by spot welding as shown at 19.

By utilizing an angle shaped lug and locating it at the corner of the box a very rigid and strong structure is secured. The angled shaped lug itself is stronger and more rigid than the simple right angled lug heretofore used and the shape of the lugs with tapered portions 18 and the disposition of the lugs at the corners of box 10 provides greater clear space at the sides for knockouts.

What I claim is:

1. An outlet box .of octagonal configuration having attaching lugs secured thereto by welding and disposed at the corners of the box for the purpose described.

2. An outlet box of octagonal configuration having attaching lugs secured thereto at the corners, each lug having vertical portions extending at angles to each other to conform to the octagonal corner angle of the box whereby increased rigidity is secured and having its exterior edges tapering upwardly toward the top to clear and provide free access to an adjacent knockout.

3. An outlet box of octagonal configuration having attaching lugs therefor disposed at the corners of the octagonal box and secured thereto by spot welding, vertical portions of a lug to vertical walls of the box, said vertical portions of each lug extending around upon two sides of the box at an octagonal corner portion thereof for the purpose described.

JAMES M. G. FULLMA N. 

